⒌ 一元操作符（unary operators） 一元操作符（也称单目运算符）有最高优 先级并且首先被计算。一元操作符位于它的操 作数前面，多个相邻的操作符从右到左计算。
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Named Unary Operators 已命名一元操作符
modal like unary operators 模态一元算子
optimization of unary operators 单目算符优化
Unary operators have one parameter, and binary operators have two parameters.
一元运算子有一个参数，而二元运算子则有两个参数。
Unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression.
一元运算符对单个操作数执行操作，如返回数值表达式的负值或正值。
The power operator binds more tightly than unary operators on its left; it binds less tightly than unary operators on its right. The syntax is.
幂运算符比在操作数左边的一元运算符有更高的优先级； 但比右面的一元运算符要低。句法为。
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